Rock County, WI population age distributions
A complete breakdown of Rock County's age demographics from 0 to 85 years, distributed across 18 age groups is listed in the table below.
| Age Group | Population | % of Total Population |
|---|---|---|
| Under 5 years | 9,510 | 5.81% |
| 5 to 9 years | 10,048 | 6.13% |
| 10 to 14 years | 10,786 | 6.58% |
| 15 to 19 years | 10,967 | 6.69% |
| 20 to 24 years | 10,145 | 6.19% |
| 25 to 29 years | 9,947 | 6.07% |
| 30 to 34 years | 9,958 | 6.08% |
| 35 to 39 years | 10,486 | 6.4% |
| 40 to 44 years | 10,165 | 6.21% |
| 45 to 49 years | 9,946 | 6.07% |
| 50 to 54 years | 10,772 | 6.58% |
| 55 to 59 years | 11,667 | 7.12% |
| 60 to 64 years | 11,624 | 7.1% |
| 65 to 69 years | 9,343 | 5.7% |
| 70 to 74 years | 7,206 | 4.4% |
| 75 to 79 years | 4,135 | 2.52% |
| 80 to 84 years | 3,809 | 2.33% |
| 85 years and over | 3,303 | 2.02% |
TABLE OF CONTENTS
Rock County, WI population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2018-2022
FIGURE 1
Rock County, WI population by age group.
The largest age group is 55 to 59 years with a population of 11,667 (7.12% of the total population).
The largest age group in Rock County, WI was for the group of age 55 to 59 years with a population of 11,667 (7.12%), according to the 2018-2022 American Community Survey.
At the same time, the smallest age group in Rock County, WI was the 85 years and over with a population of 3,303 (2.02%).
Rock County, WI population by age cohort
To better understand the age distribution of Rock County, WI's population, we divided it into the following 3 cohorts:
- Children : Under the age of 18 years
- Adults (working population): Between the age of 18 and 64 years
- Seniors: 65 years and above
FIGURE 2
Rock County, WI population by age cohort
The largest age group was 18 to 64 years with a population of 98,863 (60.35% of the total population).
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Rock County 's population under 18 was 22.68%, compared to the 22.11% nationwide.
- Rock County's working population (between 18 and 64) was 60.35%, compared to 61.36% nationwide.
- Rock County's elderly or the senior population (over 65 age) was 16.97% as compared to 16.53% nationwide.
Rock County, WI population pyramid
Population pyramid for Rock County, WI is charted below using the estimates from U.S. Census Bureau's American Community Survey 5-Year estimates. A wide base suggests population increase, narrow base indicates declining birth rates.
Key stats from our analysis of the Rock County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Rock County, WI, is 28.7.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Rock County, WI, is 26.3.
- Total dependency ratio for Rock County, WI is 55.0.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Rock County, WI is 3.8.
FIGURE 3
Rock County, WI population pyramid
Rock County population distrubution across age and gender. A wide base suggests population increase, narrow base indicates declining birth rates.
Rock County, WI population pyramid
Here's the Rock County, WI's male and female population across different age groups .
| Age Group | Population(Male) | Population(Female) | Total Population |
|---|---|---|---|
| Under 5 years | 4,980 | 4,530 | 9,510 |
| 5 to 9 years | 5,213 | 4,835 | 10,048 |
| 10 to 14 years | 5,567 | 5,219 | 10,786 |
| 15 to 19 years | 5,613 | 5,354 | 10,967 |
| 20 to 24 years | 5,193 | 4,952 | 10,145 |
| 25 to 29 years | 5,055 | 4,892 | 9,947 |
| 30 to 34 years | 5,042 | 4,916 | 9,958 |
| 35 to 39 years | 5,313 | 5,173 | 10,486 |
| 40 to 44 years | 5,143 | 5,022 | 10,165 |
| 45 to 49 years | 4,934 | 5,012 | 9,946 |
| 50 to 54 years | 5,419 | 5,353 | 10,772 |
| 55 to 59 years | 5,806 | 5,861 | 11,667 |
| 60 to 64 years | 5,884 | 5,740 | 11,624 |
| 65 to 69 years | 4,410 | 4,933 | 9,343 |
| 70 to 74 years | 3,424 | 3,782 | 7,206 |
| 75 to 79 years | 1,798 | 2,337 | 4,135 |
| 80 to 84 years | 1,727 | 2,082 | 3,809 |
| 85 years and over | 1,021 | 2,282 | 3,303 |
Things to know
What is the population of Rock County, WI under 18?
Rock County's population under the age of 18 is 37,158, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 22.68% of the total resident population of Rock County, WI.
What is the aging population in Rock County, WI?
Rock County's population aged 65 years and above was 27,796. As per the U.S. Census Bureau's American Community Survey, this population is 16.97% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2018-2022 5-Year Estimates